<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    p {
      /* normal正常 */
      /* font-weight: normal; */
      /* bold加粗  bolder更加粗 */
      /* font-weight: bold; */
      /* lighter更细 */
      font-weight: lighter;
      /* 字体加粗可以有数值 100-900   数值越大，字体越粗   400相当于normal，700相当于加粗*/
    }
  </style>
</head>

<body>
  <p>
    这个是一个p标签
  </p>
</body>

</html>